.box {
  position: static;

  .search {
    width: 100vw;
    height: inherit;
  }

  .active {
    width: 100vw;
    position: fixed;
    top: 0;

    z-index: 20;
  }

  .shade {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100vw;
    height: 100vh;
    background-color: #fff;

    z-index: 10;

    transition: 0.5s;
  }
}